MSM6542-03 Overview
The MSM6542 is a perpetual-calendar-based real time clock with an alarm function which can read and write data in units of seconds. It can be connected to various buses and can function as a peripheral IC of a microputer. The clock ranges are seconds, minutes, hours, days, months, years, and days of the week. The alarm ranges are seconds, minutes, hours, .. days, months, and days of the week. An event trigger is generated when the time matches the specified time and an alarm occurs or when the clock counter generates a carry. The interrupt and pulse outputs are provided for each of an alarm and a carry. An interface with a microputer is implemented by four data bus pins, four address bus ¡ Semiconductor REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT bus pins, three control bus pins, and two chip select pins. These pins are used to write or read data from the clock, alarm, and control...
MSM6542-03 Key Features
- Real time clock providing seconds, minutes, hours, days, months, years, and days of the week
- Multiple alarm ranges covering seconds, minutes, hours, days, months, and days of the week. A desired alarm range can be
- A periodic interrupt output interval can be selected over a wide range from 1/1024 seconds up to 10 minutes
- Interface flexibility allows for connection to many types of microprocessors
- Single read-out procedure (Read flag)
- Single power sense circuitry. (Data protect function)
- Unused registers can be used as RAM
- 30-second adjustment by software or hardware (software only for the MSM65421/-2)
- Stop and restart of clock by software or hardware (software only for the MSM65421/-2). 68
- 1 Hz output for adjustment and check of oscillation frequency (MSM6542-3 only)